Run jetifier against prebuilts directly rather than classes.jar

It turns out that the resource files inside the .aar files may
need rewriting too

Bug: 72552006
Test: Set LOCAL_JETIFIED_ENABLED for a prebuilt and built it
      See also one of the patches after this one and its topic
      which contains a sample for testing
Change-Id: I89d0b4aa8d5c6ae3abc2344dd05222cf9672d5c0
(cherry picked from commit ed170e72961dab855848bc58527923cbeba551b5)
diff --git a/core/host_java_library.mk b/core/host_java_library.mk
index 32295ab..750254f 100644
--- a/core/host_java_library.mk
+++ b/core/host_java_library.mk
@@ -102,16 +102,10 @@
 	$(MERGE_ZIPS) -j --ignore-duplicates $(if $(PRIVATE_JAR_MANIFEST),-m $(dir $@)/manifest.mf) \
             -stripDir META-INF -zipToNotStrip $< $@ $< $(call reverse-list,$(PRIVATE_STATIC_JAVA_LIBRARIES))
 
-#######################################
-LOCAL_JETIFIER_INPUT_FILE := $(full_classes_combined_jar)
-
-include $(BUILD_SYSTEM)/jetifier.mk
-#######################################
-
 # Run jarjar if necessary, otherwise just copy the file.
 ifneq ($(strip $(LOCAL_JARJAR_RULES)),)
 $(full_classes_jarjar_jar): PRIVATE_JARJAR_RULES := $(LOCAL_JARJAR_RULES)
-$(full_classes_jarjar_jar): $(LOCAL_JETIFIER_OUTPUT_FILE) $(LOCAL_JARJAR_RULES) | $(JARJAR)
+$(full_classes_jarjar_jar): $(full_classes_combined_jar) $(LOCAL_JARJAR_RULES) | $(JARJAR)
 	@echo JarJar: $@
 	$(hide) $(JAVA) -jar $(JARJAR) process $(PRIVATE_JARJAR_RULES) $< $@
 else
diff --git a/core/java.mk b/core/java.mk
index 3eb9086..9147849 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -358,13 +358,7 @@
 full_classes_jarjar_jar := $(full_classes_processed_jar)
 endif
 
-#######################################
-LOCAL_JETIFIER_INPUT_FILE := $(full_classes_jarjar_jar)
-
-include $(BUILD_SYSTEM)/jetifier.mk
-#######################################
-
-$(eval $(call copy-one-file,$(LOCAL_JETIFIER_OUTPUT_FILE),$(full_classes_jar)))
+$(eval $(call copy-one-file,$(full_classes_jarjar_jar),$(full_classes_jar)))
 
 #######################################
 LOCAL_FULL_CLASSES_PRE_JACOCO_JAR := $(full_classes_jar)
diff --git a/core/jetifier.mk b/core/jetifier.mk
index 305c9dd..33a4624 100644
--- a/core/jetifier.mk
+++ b/core/jetifier.mk
@@ -20,7 +20,7 @@
 ifeq ($(strip $(LOCAL_JETIFIER_ENABLED)),true)
   my_jetifier_input_path := $(LOCAL_JETIFIER_INPUT_FILE)
   my_files := $(intermediates.COMMON)/jetifier
-  my_jetifier_output_path := $(my_files)/classes-jetifier.jar
+  my_jetifier_output_path := $(my_files)/jetified-$(notdir $(my_jetifier_input_path))
 
 $(my_jetifier_output_path) : $(my_jetifier_input_path) $(JETIFIER)
 	rm -rf $@
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index 96e2613..0efda57 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -571,6 +571,12 @@
 my_src_aar := $(filter %.aar, $(my_prebuilt_src_file))
 ifneq ($(my_src_aar),)
 # This is .aar file, archive of classes.jar and Android resources.
+
+# run Jetifier if needed
+LOCAL_JETIFIER_INPUT_FILE := $(my_src_aar)
+include $(BUILD_SYSTEM)/jetifier.mk
+my_src_aar := $(LOCAL_JETIFIER_OUTPUT_FILE)
+
 my_src_jar := $(intermediates.COMMON)/aar/classes.jar
 my_src_proguard_options := $(intermediates.COMMON)/aar/proguard.txt
 
@@ -582,6 +588,12 @@
 	$(hide) touch $@
 	# Make sure the proguard file exists and has a new timestamp.
 	$(hide) touch $(dir $@)/proguard.txt
+else
+
+# run Jetifier if needed
+LOCAL_JETIFIER_INPUT_FILE := $(my_src_jar)
+include $(BUILD_SYSTEM)/jetifier.mk
+my_src_jar := $(LOCAL_JETIFIER_OUTPUT_FILE)
 
 endif